43results about How to "Sufficient optical performance" patented technology

The invention provides an optical imaging lens, comprising first, second, third, fourth, fifth and sixth lenses sequentially from the objective side to the image side and meeting following relational formulas: EFL / TTL> / =1 and TTL / Gmax< / =7.65. By controlling concave and convex surface arrangement of the lenses and controlling related parameters via at least one relational formula, the length of the optical imaging lens is decreased at the premise of maintaining good optical properties; the optical imaging lens is used for optical photographic imaging.

An imaging lens includes, in order from an object side, a first lens having a negative power and including a concave image-side surface, a second lens having a positive power, a stop, a third negative lens, which is a biconcave lens, a fourth lens having a positive power, and a fifth lens having a positive power and including a convex image-side surface. The imaging lens satisfies the following conditional expressions:0.18<(D4+D5) / f<0.44, and0.18<D1 / f where f denotes a focal length of an entire lens system, D1 denotes a thickness of a center of the first lens, D4 denotes a distance from an image-side surface of the second lens to the stop on an optical axis, and D5 denotes a distance from the stop to an object-side surface of the third lens on the optical axis.

The optical design for a contact type portable eye imaging apparatus, including the imaging optics and illumination optics are proposed, which utilizes miniature image sensor and solid state light emitting technology, as the next generation of medical imaging devices, in particular in ophthalmic imaging applications.

There is a need for providing a projection optical system that is appropriate for maintaining high resolution with low distortion, miniaturizing a reflector, decreasing the number of reflectors, and decreasing the depth and the bottom (or top) of a display used for a rear projection television, for example. The projection optical system according to the invention enlarges and projects images from a primary image surface existing at a reducing side to a secondary image surface existing at an enlarging side. The projection optical system has a first optical system L11 and a second optical system L12. The first optical system L11 forms an intermediate image (position II) of the primary image surface. The second optical system L12 has a concave reflector AM1 that forms the secondary image surface resulting from the intermediate image. A light beam travels from the center of the primary image surface and to the center of the secondary image surface and crosses an optical axis. The light beam is reflected on the concave reflector, crosses the optical axis again, and reaches the secondary image surface.

A projection optical system unit has a lower pedestal. The lower pedestal has first and second tubular portions opened to each other. An image formation device holding plate for a DMD is mounted on the first tubular portion at a side where one opening is formed. A mirror holder for a convex mirror is fixed on the second tubular portion at a side where the other opening is formed. A linear heat expansion coefficient in a specific direction of the lower pedestal component is set between 0.8×10−5 (1 / K) and 3.0×10−5 (1 / K).

The optical design for a contact type portable eye imaging apparatus, including the imaging optics and illumination optics are proposed, which utilizes miniature image sensor and solid state light emitting technology, as the next generation of medical imaging devices, in particular in ophthalmic imaging applications.

The invention provides a portable electronic device and an optical imaging lens thereof. The optical imaging lens consists of a first lens, a second lens, a third lens, and a fourth lens from an object side to an image side. According to the invention, with control of arrangement of concave and convex curved surfaces of all lens, the lengths of the lens is reduced under the circumstance that the good optical performance is kept.

A zoom lens includes, in order from an object side to an image side: a positive first lens unit; a negative second lens unit; a positive third lens unit; and a positive fourth lens unit, wherein the first lens unit includes a positive first lens subunit, which does not move for focusing, a positive second lens subunit, which moves during the focus adjustment, and a positive third lens subunit, which does not move for focusing; and focal lengths of the first lens unit, the second lens unit, the third lens unit, a magnification of the third lens unit U3 at a wide angle end, focal lengths of the first lens subunit, the second lens subunit appropriately satisfy certain relations.

A lens assembly has: optical members including lenses and spacing rings; and a ceramic lens frame into which the optical members are inserted. A solid lubricant is applied to at least one of a part of the inner peripheral surface of the ceramic lens frame, which part is to be in contact with at least the outer peripheral surfaces of the optical members, and the outer peripheral surfaces of the optical members. Subsequently, the lenses and spacing rings are alternately inserted into the ceramic lens frame and then pressed by a pressing ring.

The invention provides a portable electronic device and its optical imaging lens, wherein the optical imaging lens includes a first lens, a second lens, a third lens and a fourth lens sequentially from the object side to the image side. The present invention shortens the lens length under the condition of maintaining good optical performance by controlling the concave-convex surface arrangement of each lens.

A zoom lens system includes a negative first lens group, a positive second lens group, and a positive third lens group. The negative first lens group includes a negative meniscus lens element having the convex surface facing toward the object, and the positive third lens group includes a positive biconvex lens element. Upon zooming, at least the negative first lens group and the positive second lens group are moved. A diaphragm is provided on the object side of the positive second lens group, and moves integrally therewith. The zoom lens system satisfies the following conditions: 0.25<R1 / D1<0.55 . . . (1); 0.25<f2 / TL<0.45 . . . (2) wherein R1: the radius of curvature of the image-side surface of the negative meniscus lens element; D1: the distance between the negative first lens group and the positive second lens group at the short focal length extremity; f2: the focal length of the positive second lens group; and TL: the distance from the most object-side surface the negative first lens group to the most image-side surface of the positive third lens group, at the short focal length extremity.

There is provided a multifocal spectacle lens having a front surface and a back surface each of the front surface and the back surface is formed as a multifocal surface or a progressive-power surface, distributions of surface power of the front surface and the back surface being different from each other.

The invention relates to a portable electronic device and an optical imaging lens thereof. The optical imaging lens comprises five lenses. The image side surface of the first lens is provided with a convex part arranged in the area close to the periphery. The image side surface of the second lens is provided with a concave part arranged in the area close to the periphery. The image side surface of the third lens is provided with a convex part arranged in the area close to the periphery. The image side surface of the third lens is provided with a concave part arranged in the area close to an optical axis and a convex part arranged in the area close to the periphery. The fourth lens has a positive refraction rate. The image side surface of the fourth lens is provided with a concave part arranged in the area close to the optical axis and a convex part arranged in the area close to the periphery. The image side surface of the fifth lens is provided with a concave part arranged in the area close to the optical axis. The following relation is satisfied: (T1+T2) / G23>=3.65. The portable electronic device comprises a housing, an image module comprising the optical imaging lens, a lens barrel, a module backseat unit and an image sensor. The portable electronic device and the optical imaging lens thereof are good in imaging quality.

An optical lens set includes: a first, second, third, fourth and fifth lens element, an aperture stop disposed between said first and second lens element, said first lens element has negative refractive power, and has an object-side surface with a convex part in a vicinity of its periphery, said third lens element has an image-side surface with a concave part in a vicinity of its periphery, said fourth lens element has an object-side surface with a concave part in a vicinity of its periphery, said fifth element has aspherical object-side and image-side surfaces. T1, T2 and T5 are the thicknesses of said first, second and fifth lens element along the optical axis respectively, G12 and G23 are an air gaps between said first and second lens element, and between said second and third lens element along said optical axis respectively, the optical lens set satisfies the relationships: (G12+T2) / T1≤2.9 and (T1+T5+G23) / T2≤1.9.

The present invention discloses an optical imaging lens. The optical imaging lens comprises a first lens, a second lens, a third lens and a fourth lens which are sequentially distributed along an optical axis from one object side to one image side; and the first lens, the second lens, the third lens and the fourth lens satisfy an relational expression that ALT / AAG<=1.25. The optical imaging lens of the present invention is used for optical photography imaging. The length of the optical imaging lens can be decreased under a condition that excellent optical performance is maintained.

The invention discloses an optical imaging lens, which sequentially includes a first lens, a second lens, a third lens, and a fourth lens along an optical axis from an object side to an image side, and satisfies ALT / AAG ≦1.25. The invention is used for optical photography and imaging, and shortens the length of the lens under the condition of maintaining good optical performance.